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firmware: ti_sci: add CPU latency constraint management

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During system-wide suspend, check if any of the CPUs have PM QoS
resume latency constraints set.  If so, set TI SCI constraint.

TI SCI has a single system-wide latency constraint, so use the max of
any of the CPU latencies as the system-wide value.

Note: DM firmware clears all constraints at resume time, so
constraints need to be checked/updated/sent at each system suspend.

Co-developed-by: Vibhore Vardhan <vibhore@ti.com>
Signed-off-by: Vibhore Vardhan <vibhore@ti.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Dhruva Gole <d-gole@ti.com>
Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20241007-tisci-syssuspendresume-v13-5-ed54cd659a49@baylibre.com
Signed-off-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Kevin Hilman 2024-10-07 08:08:58 +02:00 committed by Nishanth Menon
parent 60357991f6
commit a7a15754c7
1 changed files with 23 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

24
drivers/firmware/ti_sci.c
View file

@ -9,6 +9,7 @@
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/bitmap.h>
#include <linux/cpu.h>
#include <linux/debugfs.h>
#include <linux/export.h>
#include <linux/io.h>
@ -19,6 +20,7 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
#include <linux/property.h>
#include <linux/semaphore.h>
#include <linux/slab.h>
@ -3666,7 +3668,27 @@ static int ti_sci_prepare_system_suspend(struct ti_sci_info *info)
static int __maybe_unused ti_sci_suspend(struct device *dev)
{
struct ti_sci_info *info = dev_get_drvdata(dev);
int ret;
struct device *cpu_dev, *cpu_dev_max = NULL;
s32 val, cpu_lat = 0;
int i, ret;
if (info->fw_caps & MSG_FLAG_CAPS_LPM_DM_MANAGED) {
for_each_possible_cpu(i) {
cpu_dev = get_cpu_device(i);
val = dev_pm_qos_read_value(cpu_dev, DEV_PM_QOS_RESUME_LATENCY);
if (val != PM_QOS_RESUME_LATENCY_NO_CONSTRAINT) {
cpu_lat = max(cpu_lat, val);
cpu_dev_max = cpu_dev;
}
}
if (cpu_dev_max) {
dev_dbg(cpu_dev_max, "%s: sending max CPU latency=%u\n", __func__, cpu_lat);
ret = ti_sci_cmd_set_latency_constraint(&info->handle,
cpu_lat, TISCI_MSG_CONSTRAINT_SET);
if (ret)
return ret;
}
}
ret = ti_sci_prepare_system_suspend(info);
if (ret)